PJB-2013-276
GENETICS OF FLORAL TRAITS IN CYTOPLASMIC MALE STERILE (CMS) AND RESTORER LINES OF HYBRID RICE (ORYZA SATIVA L.)
MAHALINGAM. A1*, R. SARASWATHI2, J. RAMALINGAM3 AND T. JAYARAJ4
Abstract
The present scientific study was taken up at Tamil Nadu Rice Research institute (TRRI), Aduthurai to study the genetic parameters and association among the floral traits of CMS lines and identification of parental lines having potential outcrossing ability for hybrid seed production. Among the five CMS lines and fifty one tester lines studied for eleven floral traits, CMS line COMS 23A registered higher mean value for style length, breadth and panicle exsertion. The genotype COMS 24A had greater stigma breadth, while COMS 25A had long style with good stigma length and breadth. All the CMS lines had above 99.50% pollen sterility. Analysis of variance revealed significant differences among the CMS lines for all floral traits studied. High heritability coupled with high genetic advance as percent of mean was recorded for five traits viz., anther length, stigma length, style breadth, glume opening angle and stigma exsertion rate suggesting the improvement of these characters through simple phenotypic selection. Association analysis of floral traits in the CMS lines revealed that glume opening angle had strong positive and significant association with stigma exsertion rate. Stigma length had positive non – significant association with stigma exsertion rate. No association between anther size and pollen fertility or spikelet fertility in tester line could be established. Out crossing will be higher in seed production of hybrids resulting from any of the four CMS lines viz., COMS 23A, COMS 25A, CRMS 31A and CRMS 32A since each CMS line had some of the desirable floral trait. COMS 23A and COMS 25A had desirable stigma characters, while CRMS 31A and CRMS 32 had desirable glume opening angle which is highly associated with higher out crossing rate.
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